export default{
  namespaced: true,
  state:()=>({
    cart:JSON.parse(uni.getStorageSync('cart') || '[]'),
  }),
  mutations:{
    addToCart(state,goods){
      const findResult = state.cart.find(x=>x.goods_id === goods.goods_id)
      
      if(!findResult){
        state.cart.push(goods)
      }else{
        findResult.goods_count++
      }
      this.commit('m_cart/saveToStorage')
    },
    //将购物车中数据持久化存储到本地
    saveToStorage(state){
      uni.setStorageSync('cart',JSON.stringify(state.cart))
    },
    updateGoodsState(state,goods){
     const findResult = state.cart.find(x=>x.goods_id===goods.goods_id)
     if(findResult){
       findResult.goods_state = goods.goods_state
       this.commit('m_cart/saveToStorage')
     }
    },
    // 更新购物车中商品的数量
    updateGoodsCount(state, goods) {
      // 根据 goods_id 查询购物车中对应商品的信息对象
      const findResult = state.cart.find(x => x.goods_id === goods.goods_id)
    
      if(findResult) {
        // 更新对应商品的数量
        findResult.goods_count = goods.goods_count
        // 持久化存储到本地
        this.commit('m_cart/saveToStorage')
      }
    },
    removeGoodsById(state,goods_id){
      state.cart = state.cart.filter(x=>x.goods_id!==goods_id)
      //持久化存储到本地
      this.commit('m_cart/saveToStorage')
    },
    // 更新所有商品的勾选状态
    updateAllGoodsState(state,newState){
      //循环更新购物车中每件商品的勾选状态
      state.cart.forEach(x=>x.goods_state = newState)
      //持久化存储到本地
       this.commit('m_cart/saveToStorage')
    }
  },
  getters:{
    total(state){
      let c=0
      state.cart.forEach(goods=>c+=goods.goods_count)
      return c
    },
    //勾选的商品总数量
    checkedCount(state){
      return state.cart.filter(x=>x.goods_state).reduce((total,item)=>total += item.goods_count,0)
    },
    //已勾选商品总价
    checkedGoodsAmount(state){
      return state.cart.filter(x=>x.goods_state).reduce((total,item)=>total +=item.goods_count * item.goods_price,0).toFixed(2)
    }
  }
}